Question

The chloride of a metal contains $71$% chlorine by mass and the vapour density of it is $50$. The atomic mass of the metal will be :

• A. 29
• B. 58
• C. 35.5
• D. 71

Answer 1

The correct option is A 29

Molecular weight $=2\times VD=2\times 50=100$
The percentage of chloride is 71%.
The percentage of metal will be $100-71=29$%.
29% of 100 g (molecular weight of metal chloride) will be the mass of metal present in 1 mole of metal chloride.
It will be 29 g which is the molar mass of the metal chloride.